docs: v0.3 content — 5 new + 3 updated docs pages

[sepehr-safari]

Summary

Adds 5 new docs pages and updates 3 existing pages for v0.3.0 content:

New Pages

1. /docs/trace-diffing — diffTraces() API and ocpp-debugkit diff CLI
2. /docs/scenario-assertions — All 8 assertion types with examples
3. /docs/ci-mode — ocpp-debugkit ci in CI pipelines, GitHub Actions integration
4. /docs/anonymize — ocpp-debugkit anonymize, what gets stripped, privacy
5. /docs/examples — Overview of all examples in examples/

Updated Pages

6. /docs (index) — Added navigation links for 5 new pages
7. /docs/cli — Added ci, anonymize, diff commands + scenario run --file

Closes #91

Checklist

• 5 new docs pages created with content for each v0.3 feature
• 2 existing docs pages updated for v0.3 features
• Navigation sidebar updated with new pages
• All code examples use current API
• No sensitive data, no maintainer email
• No changeset needed (docs-only app content)
• Lint, typecheck, test, format all pass